Trimming-cutter for sewing-machines.



J. M. MERROW. TRIMMING CUTTER FOR SEWING MACHINES.

APPLICATION FILED DEC. 9, 1905 PatentedDec. 22, 1908.

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UNITED STATES FATEN T OFFICE.

JOSEPH M. MERROW, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE MERROW MACHINE COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

TRIMMING-CUTTER FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented. Dec. 22, 1908.

Application filed. December 9, 1905. Serial No. 291,134.

T 0 all whom it may concern:

Be it known that I, Josnrrr M. Mnnnow, a citizen of the United States, residing in the city and county of Hartford, State of Connecticut, have invented certain new and use ful Improvements in TrimmingCutters for Sewing-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, and to the figures andletters of reference thereon.

This invention relates to trimming cutters its principal object being to provide a reversible cutter having a cutting edge at each end and an adjacent guide or finger each cutting edge and its guide or finger being capable of being ground or sharpened in a single plane and each cutting edge being also capable of being ground or sharpened independently of the guiding finger.

The cutter as shown is well. adapted for use in sewing machinery to trim off the edges of the material.

In the accompanying drawings-Figure l is a side elevation of the cutter, clamped to its support or carrier and shows also a portion of the companion cutter. Fig. 2 is a front elevation of the parts shown in Fig. 1. Fig. 3 is a sectional View taken on the line 3-3 of Fig. 2. Fig. 4 is a front elevation of the cutter detached. Fig. 5 is a side elevation of the cutter as seen from the left of Fig. 4. Fig. 6 is a side elevation of the cutter as seen from the right of Fig. 4. Fig. 7 is a plan view of the cutter as seen from above Fig. 4.

Similar letters of reference indicate like parts throughout the several figures of the drawings.

The cutter A is preferably made from a flat or rectangular steel bar, bent at an obtuse angle at each end in counter fac-sirnile, thereby forming a shank portion a and a relatively short limb a at each end, each limb being at an angle to the longitudinal axis of the shank. Each. limb is cut away diagonally for a portion of its length and with the out-er end forms a cutting edge as at a and a guide or finger a for each cutting edge, the effect of such cutting away at the ends of the limbs being to leave a comparatively small flat surface a at either end which may be ground together with the face of the guide or finger in a single plane to sharpen the cutting edge and overcome the effect of wear. The cutter may also be sharpened by grinding the diagonal face a at either end instead of grinding the faces or surfaces a a as may sometimes be preferable, especially when the side of the guide or finger has not become worn, but the cutting edge has become dull.

The diagonal cuts across the short limbs are both made upon the same edge of the bar and each of the bevels or faces a is preferably made at an acute angle with its corresponding flat face a while each of the cutting edges is preferably made at an obtuse angle to its corresponding finger (L The cutter is adjustably clamped to its support or carrier B by the clamp D and the clamp screw E and it will be understood that the companion cutter is secured to some portion of the machine and that one of the cutters is suitably moved, in a path approximately parallel to the acting face of the cutter A and the face or side of the companion cutter C by any known or suitable means. Ordinarily the cutter A is the moving cutter.

It will be apparent that the cutter A, after having become dull at one of its cutting edges may be reversed or turned end for end and the opposite end brought into use.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A cutter, bent at its opposite ends to form a limb at each end, each limb being formed with a cutting edge and a guide or finger therefor, the faces of the two limbs being in separated substantially parallel planes and the two edges of the cutter being also in substantially parallel planes, substantially as described.

2. As an article of manufacture, a trimming cutter formed with a straight body portion and a limb at each end at an angle to said body portion, the faces of the two limbs being in substantially parallel planes and the two edges of the cutter being also in substantially parallel planes, each of the said limbs being formed with a cutting edge and a guide or finger, substantially as described.

3. As an article of manufacture, a reversible trimming cutter with a limb at each end at an angle with the main or body portion of the cutter, the faces of the two limbs being in substantially parallel planes and the two edges of the cutter being also in substantially parallel planes, each limb being provided with a cutting edge and a guiding finger so disposed that one face of each limb may be ground in a single plane to sharpen the cutting edge and include one side of the guiding finger, substantially as described.

4. As an article of manufacture, a cutter bent at both ends forming a limb at each end, the faces of the two limbs being in substantially parallel planes and the two edges of the cutter being also in substantially parallel planes, each limb being formed with a cutting edge and a guiding finger having their outer faces in the same plane and each of which faces may be ground in a single plane to sharpen the cutting edge and include the face of the guiding finger, both of the guiding fingers being located upon the same edge relative to the shank or body portion of the cutter, substantially as described.

5. A cutter having a shank or body portion and a limb at one end at an angle to the body portion, said limb being provided with a cutting edge and a finger, the cutting edge lying in the plane of one face of the finger,

said plane being obliqueto the body portion of the cutter, substantially as described.

6. A cutter embodying a substantially straight body portion and end portions or limbs bent at an angle thereto, the faces of the two limbs being in substantially parallel planes and the two edges of the cutter being also in substantially parallel planes, said limbs each being formed into a cutting edge and a guide or finger projecting beyond said edge, one face of the guide finger and the cutting edge being in a single plane, substantially as described.

7. A cutter embodying a substantially straight body portion and end portions bent at an angle thereto in opposite directions and in substantially parallel planes and the two edges of the cutter being also in substan tially parallel planes, the said end portions each being formed into a cutting edge and a guide or finger therefor projecting beyond the cutting edge, substantially as described.

JOSEPH M. MERROl/V.

Witnesses:

ALoNzo M. LUTHER, W. O. W. STEWART. 

